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The problem of keeping stringed instruments, particularly guitars, in tune has been a continuing issue since these instruments had been invented.
An avid guitarist and engineering student at Duke University named Cosmos Lyles came up with the idea for the invention of the Evertune Bridge when he had been sitting on a couch Product developer Paul Dowd, who was also an amateur guitarist. Dowd helped Lyle expand and hone the idea into a working contraption. It took five years to turn the idea into a physical functioning device, according to two accounts, and cost $500,000. Invented by engineers Cosmos Lyles and Paul Dowd, the EverTune bridge is a spring and lever system that maintains string tension thus keeping the guitar in tune.